Appreciate it, but testing websites are still able to detect my real browser in what they call the "core" browser being used. Hopefully something can be done.

Thanks a lot for excellent addition and also that returned support "to Firefox 52.0" and above.
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Спасибо большое за отличное дополнение, а также за то что вернули поддержку "Firefox 52.0" и выше.

It does not work on Android. Otherwise it will be perfect.

askew

Great app

No graphic way for adding domains

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tested quite a few user-agent changing tools: User-Agent Switcher and Manager sticks out by far. Thanks Ray!